<?php


class INDIC {

    /* FROM hb-ot-shape-complex-indic-private.hh */
// indic_category
    const OT_X = 0;
    const OT_C = 1;
    const OT_V = 2;
    const OT_N = 3;
    const OT_H = 4;
    const OT_ZWNJ = 5;
    const OT_ZWJ = 6;
    const OT_M = 7;		/* Matra or Dependent Vowel */
    const OT_SM = 8;
    const OT_VD = 9;
    const OT_A = 10;
    const OT_NBSP = 11;
    const OT_DOTTEDCIRCLE = 12;	/* Not in the spec, but special in Uniscribe. /Very very/ special! */
    const OT_RS = 13; 		/* Register Shifter, used in Khmer OT spec */
    const OT_Coeng = 14;
    const OT_Repha = 15;
    const OT_Ra = 16; 		/* Not explicitly listed in the OT spec, but used in the grammar. */
    const OT_CM = 17;


// Based on indic_category used to make string to find syllables
// OT_ to string character (using e.g. OT_C from INDIC) hb-ot-shape-complex-indic-private.hh
    public static $indic_category_char = array(
        'x',
        'C',
        'V',
        'N',
        'H',
        'Z',
        'J',
        'M',
        'S',
        'v',
        'A',	/* Spec gives Andutta U+0952 as OT_A. However, testing shows that Uniscribe
	* treats U+0951..U+0952 all as OT_VD - see set_indic_properties */
        's',
        'D',
        'F',	/* Register shift Khmer only */
        'G',	/* Khmer only */
        'r',	/* 0D4E (dot reph) only one in Malayalam */
        'R',
        'm',	/* Consonant medial only used in Indic 0A75 in Gurmukhi  (0A00..0A7F)  : also in Lao, Myanmar, Tai Tham, Javanese & Cham  */
    );


    /* Visual positions in a syllable from left to right. */
    /* FROM hb-ot-shape-complex-indic-private.hh */
// indic_position
    const POS_START = 0;

    const POS_RA_TO_BECOME_REPH = 1;
    const POS_PRE_M = 2;
    const POS_PRE_C = 3;

    const POS_BASE_C = 4;
    const POS_AFTER_MAIN = 5;

    const POS_ABOVE_C = 6;

    const POS_BEFORE_SUB = 7;
    const POS_BELOW_C = 8;
    const POS_AFTER_SUB = 9;

    const POS_BEFORE_POST = 10;
    const POS_POST_C = 11;
    const POS_AFTER_POST = 12;

    const POS_FINAL_C = 13;
    const POS_SMVD = 14;

    const POS_END = 15;

    /*
    * Basic features.
    * These features are applied in order, one at a time, after initial_reordering.
    */
    /*
     * Must be in the same order as the indic_features array. Ones starting with _ are F_GLOBAL
     * Ones without the _ are only applied where the mask says!
     */
    const _NUKT = 0;
    const _AKHN = 1;
    const RPHF = 2;
    const _RKRF = 3;
    const PREF = 4;
    const BLWF = 5;
    const HALF = 6;
    const ABVF = 7;
    const PSTF = 8;
    const CFAR = 9;	// Khmer only
    const _VATU = 10;
    const _CJCT = 11;
    const INIT = 12;


    public static function set_indic_properties(&$info, $scriptblock ) {
        $u = $info['uni'];
        $type = self::indic_get_categories($u);
        $cat = ($type & 0x7F);
        $pos = ($type >> 8);

        /*
        * Re-assign category
        */

        if ($u == 0x17D1) $cat = self::OT_X;

        if ($cat == self::OT_X && self::in_range($u, 0x17CB, 0x17D3)) { /* Khmer Various signs */
            /* These are like Top Matras. */
            $cat = self::OT_M;
            $pos = self::POS_ABOVE_C;
        }

        if ($u == 0x17C6) $cat = self::OT_N; /* Khmer Bindu doesn't like to be repositioned. */

        if ($u == 0x17D2) $cat = self::OT_Coeng; /* Khmer coeng */

        /* The spec says U+0952 is OT_A.	However, testing shows that Uniscribe
            * treats U+0951..U+0952 all as OT_VD.
            * TESTS:
            * U+092E,U+0947,U+0952
            * U+092E,U+0952,U+0947
            * U+092E,U+0947,U+0951
            * U+092E,U+0951,U+0947
            * */
        //if ($u == 0x0952) $cat = self::OT_A;
        if (self::in_range($u, 0x0951, 0x0954))
            $cat = self::OT_VD;

        if ($u == 0x200C) $cat = self::OT_ZWNJ;
        else if ($u == 0x200D) $cat = self::OT_ZWJ;
        else if ($u == 0x25CC) $cat = self::OT_DOTTEDCIRCLE;
        else if ($u == 0x0A71) $cat = self::OT_SM; /* GURMUKHI ADDAK.	More like consonant medial. like 0A75. */

        if ($cat == self::OT_Repha) {
            /* There are two kinds of characters marked as Repha:
            * - The ones that are GenCat=Mn are already positioned visually, ie. after base. (eg. Khmer)
            * - The ones that are GenCat=Lo is encoded logically, ie. beginning of syllable. (eg. Malayalam)
            *
            * We recategorize the first kind to look like a Nukta and attached to the base directly.
            */
            if ($info['general_category'] == UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
                $cat = self::OT_N;
        }

        /*
        * Re-assign position.
        */

        if ((self::FLAG($cat) & (self::FLAG(self::OT_C) | self::FLAG(self::OT_CM) | self::FLAG(self::OT_Ra) | self::FLAG(self::OT_V) | self::FLAG(self::OT_NBSP) | self::FLAG(self::OT_DOTTEDCIRCLE)))) {	// = CONSONANT_FLAGS like is_consonant
            if ($scriptblock == UCDN::SCRIPT_KHMER) $pos = self::POS_BELOW_C;	/* Khmer differs from Indic here. */
            else $pos = self::POS_BASE_C;	/* Will recategorize later based on font lookups. */

            if (self::is_ra ($u))
                $cat = self::OT_Ra;
        }
        else if ($cat == self::OT_M) {
            $pos = self::matra_position($u, $pos);
        }
        else if ($cat == self::OT_SM || $cat == self::OT_VD) {
            $pos = self::POS_SMVD;
        }

        if ($u == 0x0B01) $pos = self::POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */

        $info['indic_category'] = $cat;
        $info['indic_position'] = $pos;
    }

// syllable_type
    const CONSONANT_SYLLABLE = 0;
    const VOWEL_SYLLABLE = 1;
    const STANDALONE_CLUSTER = 2;
    const BROKEN_CLUSTER = 3;
    const NON_INDIC_CLUSTER = 4;

    public static function set_syllables(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

        while($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER ;
            // CONSONANT_SYLLABLE Consonant syllable
            // From OT spec:
            if (preg_match('/^([CR]m*[N]?(H[ZJ]?|[ZJ]H))*[CR]m*[N]?[A]?(H[ZJ]?|[M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s,$ptr), $ma)) {
                // From HarfBuzz:
                //if (preg_match('/^r?([CR]J?(Z?[N]{0,2})?[ZJ]?H(J[N]?)?){0,4}[CR]J?(Z?[N]{0,2})?A?((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE ;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            // From OT spec:
            else if (preg_match('/^(RH|r)?V[N]?([ZJ]?H[CR]m*|J[CR]m*)?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s,$ptr), $ma)) {
                // From HarfBuzz:
                //else if (preg_match('/^(RH|r)?V(Z?[N]{0,2})?(J|([ZJ]?H(J[N]?)?[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2})/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE ;
            }

            /* Apply only if it's a word start. */
            // STANDALONE_CLUSTER Stand Alone syllable at start of word
            // From OT spec:
            else if (($ptr==0 ||
                    $o[$ptr - 1]['general_category'] < UCDN::UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER ||
                    $o[$ptr - 1]['general_category'] > UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK
                )

                && (preg_match('/^(RH|r)?[sD][N]?([ZJ]?H[CR]m*)?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s,$ptr), $ma))) {
                // From HarfBuzz:
                // && (preg_match('/^(RH|r)?[sD](Z?[N]{0,2})?(([ZJ]?H(J[N]?)?)[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::STANDALONE_CLUSTER ;
            }

            // BROKEN_CLUSTER syllable
            else if (preg_match('/^(RH|r)?[N]?([ZJ]?H[CR])?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s,$ptr), $ma)) {
                // From HarfBuzz:
                //else if (preg_match('/^(RH|r)?(Z?[N]{0,2})?(([ZJ]?H(J[N]?)?)[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                if (strlen($ma[0])) {	// May match blank
                    $syllable_length = strlen($ma[0]);
                    $syllable_type = self::BROKEN_CLUSTER ;
                    $broken_syllables = true;
                }
            }

            for ($i = $ptr; $i < $ptr+$syllable_length; $i++) { $o[$i]['syllable'] = ($syllable_serial << 4) | $syllable_type; }
            $ptr += $syllable_length ;
            $syllable_serial++;
            if ($syllable_serial == 16) $syllable_serial = 1;
        }
    }


    public static function set_syllables_sinhala(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

        while($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER ;
            // CONSONANT_SYLLABLE Consonant syllable
            // From OT spec:
            if (preg_match('/^([CR]HJ|[CR]JH){0,8}[CR][HM]{0,3}[S]{0,1}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE ;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            // From OT spec:
            else if (preg_match('/^V[S]{0,1}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE ;
            }

            for ($i = $ptr; $i < $ptr+$syllable_length; $i++) { $o[$i]['syllable'] = ($syllable_serial << 4) | $syllable_type; }
            $ptr += $syllable_length ;
            $syllable_serial++;
            if ($syllable_serial == 16) $syllable_serial = 1;
        }
    }

    public static function set_syllables_khmer(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

        while($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER ;
            // CONSONANT_SYLLABLE Consonant syllable
            if (preg_match('/^r?([CR]J?((Z?F)?[N]{0,2})?[ZJ]?G(JN?)?){0,4}[CR]J?((Z?F)?[N]{0,2})?A?((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})?(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE ;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            else if (preg_match('/^(RH|r)?V((Z?F)?[N]{0,2})?(J|([ZJ]?G(JN?)?[CR]J?((Z?F)?[N]{0,2})?){0,4}((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})?(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2})/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE ;
            }


            // BROKEN_CLUSTER syllable
            else if (preg_match('/^(RH|r)?((Z?F)?[N]{0,2})?(([ZJ]?G(JN?)?)[CR]J?((Z?F)?[N]{0,2})?){0,4}((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                if (strlen($ma[0])) {	// May match blank
                    $syllable_length = strlen($ma[0]);
                    $syllable_type = self::BROKEN_CLUSTER ;
                    $broken_syllables = true;
                }
            }

            for ($i = $ptr; $i < $ptr+$syllable_length; $i++) { $o[$i]['syllable'] = ($syllable_serial << 4) | $syllable_type; }
            $ptr += $syllable_length ;
            $syllable_serial++;
            if ($syllable_serial == 16) $syllable_serial = 1;
        }
    }

    public static function initial_reordering(&$info, $GSUBdata, $broken_syllables, $indic_config, $scriptblock, $is_old_spec, $dottedcircle) {

        self::update_consonant_positions ($info, $GSUBdata);

        if ($broken_syllables && $dottedcircle) { self::insert_dotted_circles ($info, $dottedcircle); }

        $count = count($info);
        if (!$count) return;
        $last = 0;
        $last_syllable = $info[0]['syllable'];
        for ($i = 1; $i < $count; $i++) {
            if ($last_syllable != $info[$i]['syllable']) {
                self::initial_reordering_syllable ($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $i);
                $last = $i;
                $last_syllable = $info[$last]['syllable'];
            }
        }
        self::initial_reordering_syllable($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $count);
    }

    public static function update_consonant_positions(&$info, $GSUBdata) {
        $count = count($info);
        for ($i = 0; $i < $count; $i++) {
            if ($info[$i]['indic_position'] == self::POS_BASE_C) {
                $c = $info[$i]['uni'];
                // If would substitute...
                if (isset($GSUBdata['pref'][$c])) { $info[$i]['indic_position'] = self::POS_POST_C; }
                else if (isset($GSUBdata['blwf'][$c])) { $info[$i]['indic_position'] = self::POS_BELOW_C; }
                else if (isset($GSUBdata['pstf'][$c])) { $info[$i]['indic_position'] = self::POS_POST_C; }
            }
        }
    }

    public static function insert_dotted_circles(&$info, $dottedcircle) {
        $idx = 0;
        $last_syllable = 0;
        while ($idx < count($info)) {
            $syllable = $info[$idx]['syllable'];
            $syllable_type = ($syllable & 0x0F);
            if ($last_syllable != $syllable && $syllable_type == self::BROKEN_CLUSTER) {
                $last_syllable = $syllable;

                $dottedcircle[0]['syllable'] = $info[$idx]['syllable'];

                /* Insert dottedcircle after possible Repha. */
                while ($idx < count($info) && $last_syllable == $info[$idx]['syllable'] && $info[$idx]['indic_category'] == self::OT_Repha)
                    $idx++;
                array_splice($info, $idx, 0, $dottedcircle);
            }
            else
                $idx++;
        }
        // I am not sue how this code below got in here, since $idx should now be > count($info) and thus invalid.
        // In case I am missing something(!) I'll leave a warning here for now:
        if (isset($info[$idx])) { die("This shouldn't happen (in otl.php)"); exit; }
        // In case of final bloken cluster...
        //$syllable = $info[$idx]['syllable'];
        //$syllable_type = ($syllable & 0x0F);
        //if ($last_syllable != $syllable && $syllable_type == self::BROKEN_CLUSTER) {
        //	$dottedcircle[0]['syllable'] = $info[$idx]['syllable'];
        //	array_splice($info, $idx, 0, $dottedcircle);
        //}
    }



    /* Rules from:
     * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */

    public static function initial_reordering_syllable (&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $start, $end) {
        /* vowel_syllable: We made the vowels look like consonants. So uses the consonant logic! */
        /* broken_cluster: We already inserted dotted-circles, so just call the standalone_cluster. */
        /* standalone_cluster: We treat NBSP/dotted-circle as if they are consonants, so we should just chain. */

        $syllable_type = ($info[$start]['syllable'] & 0x0F);
        if ($syllable_type==self::NON_INDIC_CLUSTER ) { return; }
        if ($syllable_type==self::BROKEN_CLUSTER  || $syllable_type==self::STANDALONE_CLUSTER ) {
            //if ($uniscribe_bug_compatible) {
            /* For dotted-circle, this is what Uniscribe does:
            * If dotted-circle is the last glyph, it just does nothing.
            * i.e. It doesn't form Reph. */
            if ($info[$end - 1]['indic_category'] == self::OT_DOTTEDCIRCLE) {
                return;
            }
        }

        /* 1. Find base consonant:
        *
        * The shaping engine finds the base consonant of the syllable, using the
        * following algorithm: starting from the end of the syllable, move backwards
        * until a consonant is found that does not have a below-base or post-base
        * form (post-base forms have to follow below-base forms), or that is not a
        * pre-base reordering Ra, or arrive at the first consonant. The consonant
        * stopped at will be the base.
        *
        *	o If the syllable starts with Ra + Halant (in a script that has Reph)
        *	and has more than one consonant, Ra is excluded from candidates for
        *	base consonants.
        */

        $base = $end;
        $has_reph = false;
        $limit = $start;

        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            /* -> If the syllable starts with Ra + Halant (in a script that has Reph)
            *	and has more than one consonant, Ra is excluded from candidates for
            *	base consonants. */
            if (count($GSUBdata['rphf']) /* ?? $indic_plan->mask_array[RPHF] */ && $start + 3 <= $end &&
                (
                    ($indic_config[4] == self::REPH_MODE_IMPLICIT && !self::is_joiner($info[$start + 2])) ||
                    ($indic_config[4] == self::REPH_MODE_EXPLICIT && $info[$start + 2]['indic_category'] == self::OT_ZWJ)
                )) {
                /* See if it matches the 'rphf' feature. */
                //$glyphs = array($info[$start]['uni'], $info[$start + 1]['uni']);
                //if ($indic_plan->rphf->would_substitute ($glyphs, count($glyphs), true, face)) {
                if (isset($GSUBdata['rphf'][$info[$start]['uni']]) && self::is_halant_or_coeng($info[$start + 1]) ) {
                    $limit += 2;
                    while ($limit < $end && self::is_joiner($info[$limit]))
                        $limit++;
                    $base = $start;
                    $has_reph = true;
                }
            }
            else if ($indic_config[4] == self::REPH_MODE_LOG_REPHA && $info[$start]['indic_category'] == self::OT_Repha) {
                $limit += 1;
                while ($limit < $end && self::is_joiner($info[$limit]))
                    $limit++;
                $base = $start;
                $has_reph = true;
            }
        }

        switch ($indic_config[2]) {	// base_pos
            case self::BASE_POS_LAST:
                /* -> starting from the end of the syllable, move backwards */
                $i = $end;
                $seen_below = false;
                do {
                    $i--;
                    /* -> until a consonant is found */
                    if (self::is_consonant($info[$i])) {
                        /* -> that does not have a below-base or post-base form
                        * (post-base forms have to follow below-base forms), */
                        if ($info[$i]['indic_position'] != self::POS_BELOW_C && ($info[$i]['indic_position'] != self::POS_POST_C || $seen_below)) {
                            $base = $i;
                            break;
                        }
                        if ($info[$i]['indic_position'] == self::POS_BELOW_C)
                            $seen_below = true;

                        /* -> or that is not a pre-base reordering Ra,
                        *
                        * IMPLEMENTATION NOTES:
                        *
                        * Our pre-base reordering Ra's are marked POS_POST_C, so will be skipped
                        * by the logic above already.
                        */

                        /* -> or arrive at the first consonant. The consonant stopped at will
                        * be the base. */
                        $base = $i;
                    }
                    else {
                        /* A ZWJ after a Halant stops the base search, and requests an explicit
                        * half form.
                        * [A ZWJ before a Halant, requests a subjoined form instead, and hence
                        * search continues. This is particularly important for Bengali
                        * sequence Ra,H,Ya that should form Ya-Phalaa by subjoining Ya] */
                        if ($start < $i && $info[$i]['indic_category'] == self::OT_ZWJ && $info[$i - 1]['indic_category'] == self::OT_H) {
                            if (!defined("OMIT_INDIC_FIX_1") || OMIT_INDIC_FIX_1!=1) { $base = $i; }	// INDIC_FIX_1
                            break;
                        }
                        // ZKI8
                        if ($start < $i && $info[$i]['indic_category'] == self::OT_ZWNJ) {
                            break;
                        }
                    }
                } while ($i > $limit);
                break;

            case self::BASE_POS_FIRST:
                /* In scripts without half forms (eg. Khmer), the first consonant is always the base. */

                if (!$has_reph)
                    $base = $limit;

                /* Find the last base consonant that is not blocked by ZWJ.	If there is
                * a ZWJ right before a base consonant, that would request a subjoined form. */
                for ($i = $limit; $i < $end; $i++) {
                    if (self::is_consonant($info[$i]) && $info[$i]['indic_position'] == self::POS_BASE_C) {
                        if ($limit < $i && $info[$i - 1]['indic_category'] == self::OT_ZWJ)
                            break;
                        else
                            $base = $i;
                    }
                }

                /* Mark all subsequent consonants as below. */
                for ($i = $base + 1; $i < $end; $i++) {
                    if (self::is_consonant ($info[$i]) && $info[$i]['indic_position'] == self::POS_BASE_C)
                        $info[$i]['indic_position'] = self::POS_BELOW_C;
                }
                break;
            //default:
            //assert (false);
            /* fallthrough */
        }

        /* -> If the syllable starts with Ra + Halant (in a script that has Reph)
        *	and has more than one consonant, Ra is excluded from candidates for
        *	base consonants.
        *
        *	Only do this for unforced Reph. (ie. not for Ra,H,ZWJ. */
        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if ($has_reph && $base == $start && $limit - $base <= 2) {
                /* Have no other consonant, so Reph is not formed and Ra becomes base. */
                $has_reph = false;
            }
        }

        /* 2. Decompose and reorder Matras:
        *
        * Each matra and any syllable modifier sign in the cluster are moved to the
        * appropriate position relative to the consonant(s) in the cluster. The
        * shaping engine decomposes two- or three-part matras into their constituent
        * parts before any repositioning. Matra characters are classified by which
        * consonant in a conjunct they have affinity for and are reordered to the
        * following positions:
        *
        *		o Before first half form in the syllable
        *		o After subjoined consonants
        *		o After post-form consonant
        *		o After main consonant (for above marks)
        *
        * IMPLEMENTATION NOTES:
        *
        * The normalize() routine has already decomposed matras for us, so we don't
        * need to worry about that.
        */


        /* 3.	Reorder marks to canonical order:
        *
        * Adjacent nukta and halant or nukta and vedic sign are always repositioned
        * if necessary, so that the nukta is first.
        *
        * IMPLEMENTATION NOTES:
        *
        * Use the combining Class from Unicode categories? to bubble_sort.
        */

        /* Reorder characters */

        for ($i = $start; $i < $base; $i++)
            $info[$i]['indic_position'] = min(self::POS_PRE_C, $info[$i]['indic_position']);

        if ($base < $end)
            $info[$base]['indic_position'] = self::POS_BASE_C;

        /* Mark final consonants. A final consonant is one appearing after a matra,
        * ? only in Khmer. */
        for ($i = $base + 1; $i < $end; $i++)
            if ($info[$i]['indic_category'] == self::OT_M) {
                for ($j = $i + 1; $j < $end; $j++)
                    if (self::is_consonant ($info[$j])) {
                        $info[$j]['indic_position'] = self::POS_FINAL_C;
                        break;
                    }
                break;
            }

        /* Handle beginning Ra */
        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if ($has_reph)
                $info[$start]['indic_position'] = self::POS_RA_TO_BECOME_REPH;
        }


        /* For old-style Indic script tags, move the first post-base Halant after
        * last consonant.	Only do this if there is *not* a Halant after last
        * consonant. Otherwise it becomes messy. */
        if ($is_old_spec) {
            for ($i = $base + 1; $i < $end; $i++) {
                if ($info[$i]['indic_category'] == self::OT_H) {
                    for ($j = $end - 1; $j > $i; $j--) {
                        if (self::is_consonant($info[$j]) || $info[$j]['indic_category'] == self::OT_H) { break; }
                    }
                    if ($info[$j]['indic_category'] != self::OT_H && $j > $i) {
                        /* Move Halant to after last consonant. */
                        self::_move_info_pos($info, $i, $j+1);
                    }
                    break;
                }
            }
        }

        /* Attach misc marks to previous char to move with them. */
        $last_pos = self::POS_START;
        for ($i = $start; $i < $end; $i++) {
            if ((self::FLAG($info[$i]['indic_category']) & (self::FLAG(self::OT_ZWJ)| self::FLAG(self::OT_ZWNJ) | self::FLAG(self::OT_N) | self::FLAG (self::OT_RS) | self::FLAG (self::OT_H) | self::FLAG (self::OT_Coeng) ))) {
                $info[$i]['indic_position'] = $last_pos;
                if ($info[$i]['indic_category'] == self::OT_H && $info[$i]['indic_position'] == self::POS_PRE_M) {
                    /*
                    * Uniscribe doesn't move the Halant with Left Matra.
                    * TEST: U+092B,U+093F,U+094DE
                    * We follow.	This is important for the Sinhala
                    * U+0DDA split matra since it decomposes to U+0DD9,U+0DCA
                    * where U+0DD9 is a left matra and U+0DCA is the virama.
                    * We don't want to move the virama with the left matra.
                    * TEST: U+0D9A,U+0DDA
                    */
                    for ($j = $i; $j > $start; $j--)
                        if ($info[$j - 1]['indic_position'] != self::POS_PRE_M) {
                            $info[$i]['indic_position'] = $info[$j - 1]['indic_position'];
                            break;
                        }
                }
            }
            else if ($info[$i]['indic_position'] != self::POS_SMVD) {
                $last_pos = $info[$i]['indic_position'];
            }
        }

        /* Re-attach ZWJ, ZWNJ, and halant to next char, for after-base consonants. */
        $last_halant = $end;
        for ($i = $base + 1; $i < $end; $i++) {
            if (self::is_halant_or_coeng($info[$i]))
                $last_halant = $i;
            else if (self::is_consonant($info[$i])) {
                for ($j = $last_halant; $j < $i; $j++)
                    if ($info[$j]['indic_position'] != self::POS_SMVD)
                        $info[$j]['indic_position'] = $info[$i]['indic_position'];
            }
        }


        if ($scriptblock == UCDN::SCRIPT_KHMER) {
            /* KHMER_FIX_2 */
            /* Move Coeng+RO (Halant,Ra) sequence before base consonant. */
            for ($i = $base + 1; $i < $end; $i++) {
                if (self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni'])) {
                    $info[$i]['indic_position'] = self::POS_PRE_C;
                    $info[$i + 1]['indic_position'] = self::POS_PRE_C;
                    break;
                }
            }
        }


        /*
        if (!defined("OMIT_INDIC_FIX_2") || OMIT_INDIC_FIX_2 != 1) {
            // INDIC_FIX_2
            $ZWNJ_found = false;
            $POST_ZWNJ_c_found = false;
            for ($i = $base + 1; $i < $end; $i++) {
                if ($info[$i]['indic_category'] == self::OT_ZWNJ) { $ZWNJ_found = true; }
                else if ($ZWNJ_found && $info[$i]['indic_category'] == self::OT_C) { $POST_ZWNJ_c_found = true; }
                else if ($POST_ZWNJ_c_found && $info[$i]['indic_position'] == self::POS_BEFORE_SUB) { $info[$i]['indic_position'] = self::POS_AFTER_SUB; }
            }
        }
        */

        /* Setup masks now */
        for ($i = $start; $i < $end; $i++) {
            $info[$i]['mask'] = 0;
        }


        if ($scriptblock == UCDN::SCRIPT_KHMER) {
            /* Find a Coeng+RO (Halant,Ra) sequence and mark it for pre-base processing. */
            $mask = self::FLAG(self::PREF);
            for ($i = $base; $i < $end-1; $i++) {	/* KHMER_FIX_1 From $start (not base) */
                if (self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni'])  ) {

                    $info[$i]['mask'] |= self::FLAG(self::PREF);
                    $info[$i + 1]['mask'] |= self::FLAG(self::PREF);

                    /* Mark the subsequent stuff with 'cfar'.  Used in Khmer.
                    * Read the feature spec.
                    * This allows distinguishing the following cases with MS Khmer fonts:
                    * U+1784,U+17D2,U+179A,U+17D2,U+1782  [C+Coeng+RO+Coeng+C] => Should activate CFAR
                    * U+1784,U+17D2,U+1782,U+17D2,U+179A  [C+Coeng+C+Coeng+RO] => Should NOT activate CFAR
                    */
                    for ($j=($i+2); $j < $end; $j++)
                        $info[$j]['mask'] |= self::FLAG(self::CFAR);

                    break;
                }
            }
        }



        /* Sit tight, rock 'n roll! */
        self::bubble_sort ($info, $start, $end - $start);

        /* Find base again */
        $base = $end;
        for ($i = $start; $i < $end; $i++) {
            if ($info[$i]['indic_position'] == self::POS_BASE_C) {
                $base = $i;
                break;
            }
        }

        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            /* Reph */
            for ($i = $start; $i < $end; $i++) {
                if ($info[$i]['indic_position'] == self::POS_RA_TO_BECOME_REPH) {
                    $info[$i]['mask'] |= self::FLAG(self::RPHF);
                }
            }

            /* Pre-base */
            $mask = self::FLAG(self::HALF);
            for ($i = $start; $i < $base; $i++) {
                $info[$i]['mask'] |= $mask;
            }
        }

        /* Post-base */
        $mask = (self::FLAG(self::BLWF) | self::FLAG(self::ABVF) | self::FLAG(self::PSTF));
        for ($i = $base + 1; $i < $end; $i++) {
            $info[$i]['mask'] |= $mask;
        }


        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if (!defined("OMIT_INDIC_FIX_3") || OMIT_INDIC_FIX_3 != 1) {
                /* INDIC_FIX_3 */
                /* Find a (pre-base) Consonant, Halant,Ra sequence and mark Halant|Ra for below-base BLWF processing. */
                // TEST CASE &#x995;&#x9cd;&#x9b0;&#x9cd;&#x995; in FreeSans versus Vrinda
                if (($base - $start) >= 3) {
                    for ($i = $start; $i < ($base-2); $i++) {
                        if (self::is_consonant($info[$i])) {
                            if (self::is_halant_or_coeng($info[$i + 1]) && self::is_ra($info[$i + 2]['uni'])) {
                                // If would substitute Halant+Ra...BLWF
                                if (isset($GSUBdata['blwf'][$info[$i+2]['uni']])) {
                                    $info[$i + 1]['mask'] |= self::FLAG(self::BLWF);
                                    $info[$i + 2]['mask'] |= self::FLAG(self::BLWF);
                                }
                                /* If would not substitute as blwf, mark Ra+Halant for RPHF using following Halant (if present) */
                                else if (self::is_halant_or_coeng($info[$i + 3])) {
                                    $info[$i + 2]['mask'] |= self::FLAG(self::RPHF);
                                    $info[$i + 3]['mask'] |= self::FLAG(self::RPHF);
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }



        if ($is_old_spec && $scriptblock == UCDN::SCRIPT_DEVANAGARI) {
            /* Old-spec eye-lash Ra needs special handling.	From the spec:
            * "The feature 'below-base form' is applied to consonants
            * having below-base forms and following the base consonant.
            * The exception is vattu, which may appear below half forms
            * as well as below the base glyph. The feature 'below-base
            * form' will be applied to all such occurrences of Ra as well."
            *
            * Test case: U+0924,U+094D,U+0930,U+094d,U+0915
            * with Sanskrit 2003 font.
            *
            * However, note that Ra,Halant,ZWJ is the correct way to
            * request eyelash form of Ra, so we wouldbn't inhibit it
            * in that sequence.
            *
            * Test case: U+0924,U+094D,U+0930,U+094d,U+200D,U+0915
            */
            for ($i = $start; ($i + 1) < $base; $i++) {
                if ($info[$i]['indic_category'] == self::OT_Ra && $info[$i+1]['indic_category'] == self::OT_H &&
                    ($i + 2 == $base || $info[$i+2]['indic_category'] != self::OT_ZWJ)) {
                    $info[$i]['mask'] |= self::FLAG(self::BLWF);
                    $info[$i+1]['mask'] |= self::FLAG(self::BLWF);
                }
            }
        }

        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if (count($GSUBdata['pref']) && $base + 2 < $end) {
                /* Find a Halant,Ra sequence and mark it for pre-base processing. */
                for ($i = $base + 1; $i + 1 < $end; $i++) {
                    // If old_spec find Ra-Halant...
                    if ((isset($GSUBdata['pref'][$info[$i + 1]['uni']]) && self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni'])  ) ||
                        ($is_old_spec && isset($GSUBdata['pref'][$info[$i]['uni']]) && self::is_halant_or_coeng($info[$i + 1]) && self::is_ra($info[$i]['uni'])  )
                    ) {
                        $info[$i++]['mask'] |= self::FLAG(self::PREF);
                        $info[$i++]['mask'] |= self::FLAG(self::PREF);
                        break;
                    }
                }
            }
        }


        /* Apply ZWJ/ZWNJ effects */
        for ($i = $start + 1; $i < $end; $i++) {
            if (self::is_joiner ($info[$i])) {
                $non_joiner = ($info[$i]['indic_category'] == self::OT_ZWNJ);
                $j = $i;
                while ($j > $start) {
                    if (defined("OMIT_INDIC_FIX_4") && OMIT_INDIC_FIX_4 == 1) {
                        // INDIC_FIX_4 = do nothing - carry on //
                        // ZWNJ should block H C from forming blwf post-base - need to unmask backwards beyond first consonant arrived at //
                        if  (!self::is_consonant($info[$j])) { break; }
                    }
                    $j--;

                    /* ZWJ/ZWNJ should disable CJCT.	They do that by simply
                     * being there, since we don't skip them for the CJCT
                     * feature (ie. F_MANUAL_ZWJ) */

                    /* A ZWNJ disables HALF. */
                    if ($non_joiner) {
                        $info[$j]['mask'] &= ~(self::FLAG(self::HALF) | self::FLAG(self::BLWF));
                    }

                }
            }
        }
    }

    public static function final_reordering (&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec) {
        $count = count($info);
        if (!$count) return;
        $last = 0;
        $last_syllable = $info[0]['syllable'];
        for ($i = 1; $i < $count; $i++) {
            if ($last_syllable != $info[$i]['syllable']) {
                self::final_reordering_syllable ($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $i);
                $last = $i;
                $last_syllable = $info[$last]['syllable'];
            }
        }
        self::final_reordering_syllable ($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $count);

    }

    public static function final_reordering_syllable (&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $start, $end) {

        /* 4. Final reordering:
        *
        * After the localized forms and basic shaping forms GSUB features have been
        * applied (see below), the shaping engine performs some final glyph
        * reordering before applying all the remaining font features to the entire
        * cluster.
        */

        /* Find base again */
        for ($base = $start; $base < $end; $base++)
            if ($info[$base]['indic_position'] >= self::POS_BASE_C) {
                if ($start < $base && $info[$base]['indic_position'] > self::POS_BASE_C)
                    $base--;
                break;
            }
        if ($base == $end && $start < $base && $info[$base - 1]['indic_category'] != self::OT_ZWJ)
            $base--;
        while ($start < $base && isset($info[$base]) && ($info[$base]['indic_category'] == self::OT_H || $info[$base]['indic_category'] == self::OT_N))
            $base--;


        /*	o Reorder matras:
        *
        *	If a pre-base matra character had been reordered before applying basic
        *	features, the glyph can be moved closer to the main consonant based on
        *	whether half-forms had been formed. Actual position for the matra is
        *	defined as "after last standalone halant glyph, after initial matra
        *	position and before the main consonant". If ZWJ or ZWNJ follow this
        *	halant, position is moved after it.
        */


        if ($start + 1 < $end && $start < $base) { 	/* Otherwise there can't be any pre-base matra characters. */
            /* If we lost track of base, alas, position before last thingy. */
            $new_pos = ($base == $end) ? $base - 2 : $base - 1;

            /* Malayalam / Tamil do not have "half" forms or explicit virama forms.
            * The glyphs formed by 'half' are Chillus or ligated explicit viramas.
            * We want to position matra after them.
            */
            if ($scriptblock != UCDN::SCRIPT_MALAYALAM && $scriptblock != UCDN::SCRIPT_TAMIL) {
                while ($new_pos > $start && !(self::is_one_of ($info[$new_pos], (self::FLAG(self::OT_M) | self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng)))))
                    $new_pos--;

                /* If we found no Halant we are done.
                * Otherwise only proceed if the Halant does
                * not belong to the Matra itself! */
                if (self::is_halant_or_coeng($info[$new_pos]) && $info[$new_pos]['indic_position'] != self::POS_PRE_M) {
                    /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
                    if ($new_pos + 1 < $end && self::is_joiner($info[$new_pos + 1]))
                        $new_pos++;
                }
                else
                    $new_pos = $start; /* No move. */
            }

            if ($start < $new_pos && $info[$new_pos]['indic_position'] != self::POS_PRE_M) {
                /* Now go see if there's actually any matras... */
                for ($i = $new_pos; $i > $start; $i--)
                    if ($info[$i - 1]['indic_position'] == self::POS_PRE_M) {
                        $old_pos = $i - 1;
                        //memmove (&info[$old_pos], &info[$old_pos + 1], ($new_pos - $old_pos) * sizeof ($info[0]));
                        self::_move_info_pos($info, $old_pos, $new_pos+1);

                        if ($old_pos < $base && $base <= $new_pos) /* Shouldn't actually happen. */
                            $base--;
                        $new_pos--;
                    }
            }
        }


        /*	o Reorder reph:
        *
        *	Reph's original position is always at the beginning of the syllable,
        *	(i.e. it is not reordered at the character reordering stage). However,
        *	it will be reordered according to the basic-forms shaping results.
        *	Possible positions for reph, depending on the script, are; after main,
        *	before post-base consonant forms, and after post-base consonant forms.
        */

        /* If there's anything after the Ra that has the REPH pos, it ought to be halant.
        * Which means that the font has failed to ligate the Reph.	In which case, we
        * shouldn't move. */
        if ($start + 1 < $end &&
            $info[$start]['indic_position'] == self::POS_RA_TO_BECOME_REPH && $info[$start + 1]['indic_position'] != self::POS_RA_TO_BECOME_REPH) {
            $reph_pos = $indic_config[3];
            $skip_to_reph_step_5 = false;
            $skip_to_reph_move = false;

            /*	1. If reph should be positioned after post-base consonant forms,
            *	proceed to step 5.
            */
            if ($reph_pos == self::REPH_POS_AFTER_POST) {
                $skip_to_reph_step_5 = true;
            }

            /*	2. If the reph repositioning class is not after post-base: target
            *	position is after the first explicit halant glyph between the
            *	first post-reph consonant and last main consonant. If ZWJ or ZWNJ
            *	are following this halant, position is moved after it. If such
            *	position is found, this is the target position. Otherwise,
            *	proceed to the next step.
            *
            *	Note: in old-implementation fonts, where classifications were
            *	fixed in shaping engine, there was no case where reph position
            *	will be found on this step.
            */

            if (!$skip_to_reph_step_5) {

                $new_reph_pos = $start + 1;

                while ($new_reph_pos < $base && !self::is_halant_or_coeng($info[$new_reph_pos]))
                    $new_reph_pos++;

                if ($new_reph_pos < $base && self::is_halant_or_coeng($info[$new_reph_pos])) {
                    /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */
                    if ($new_reph_pos + 1 < $base && self::is_joiner ($info[$new_reph_pos + 1]))
                        $new_reph_pos++;
                    $skip_to_reph_move =true;
                }
            }

            /*	3. If reph should be repositioned after the main consonant: find the
            *	first consonant not ligated with main, or find the first
            *	consonant that is not a potential pre-base reordering Ra.
            */
            if ($reph_pos == self::REPH_POS_AFTER_MAIN && !$skip_to_reph_move && !$skip_to_reph_step_5) {
                $new_reph_pos = $base;
                /* XXX Skip potential pre-base reordering Ra. */
                while ($new_reph_pos + 1 < $end && $info[$new_reph_pos + 1]['indic_position'] <= self::POS_AFTER_MAIN)
                    $new_reph_pos++;
                if ($new_reph_pos < $end)
                    $skip_to_reph_move =true;
            }

            /*	4. If reph should be positioned before post-base consonant, find
            *	first post-base classified consonant not ligated with main. If no
            *	consonant is found, the target position should be before the
            *	first matra, syllable modifier sign or vedic sign.
            */
            /* This is our take on what step 4 is trying to say (and failing, BADLY). */
            if ($reph_pos == self::REPH_POS_AFTER_SUB && !$skip_to_reph_move && !$skip_to_reph_step_5) {
                $new_reph_pos = $base;
                while ($new_reph_pos < $end && isset($info[$new_reph_pos + 1]['indic_position']) &&
                    !( self::FLAG($info[$new_reph_pos + 1]['indic_position']) & (self::FLAG(self::POS_POST_C) | self::FLAG(self::POS_AFTER_POST) | self::FLAG(self::POS_SMVD)))) {
                    $new_reph_pos++;
                }
                if ($new_reph_pos < $end) { $skip_to_reph_move =true; }
            }

            /*	5. If no consonant is found in steps 3 or 4, move reph to a position
            *		immediately before the first post-base matra, syllable modifier
            *		sign or vedic sign that has a reordering class after the intended
            *		reph position. For example, if the reordering position for reph
            *		is post-main, it will skip above-base matras that also have a
            *		post-main position.
            */
            if (!$skip_to_reph_move) {
                /* Copied from step 2. */
                $new_reph_pos = $start + 1;
                while ($new_reph_pos < $base && !self::is_halant_or_coeng($info[$new_reph_pos]))
                    $new_reph_pos++;

                if ($new_reph_pos < $base && self::is_halant_or_coeng($info[$new_reph_pos])) {
                    /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */
                    if ($new_reph_pos + 1 < $base && self::is_joiner($info[$new_reph_pos + 1]))
                        $new_reph_pos++;
                    $skip_to_reph_move =true;
                }
            }


            /*	6. Otherwise, reorder reph to the end of the syllable.
            */
            if (!$skip_to_reph_move) {
                $new_reph_pos = $end - 1;
                while ($new_reph_pos > $start && $info[$new_reph_pos]['indic_position'] == self::POS_SMVD)
                    $new_reph_pos--;

                /*
                * If the Reph is to be ending up after a Matra,Halant sequence,
                * position it before that Halant so it can interact with the Matra.
                * However, if it's a plain Consonant,Halant we shouldn't do that.
                * Uniscribe doesn't do this.
                * TEST: U+0930,U+094D,U+0915,U+094B,U+094D
                */
                //if (!$hb_options.uniscribe_bug_compatible && self::is_halant_or_coeng($info[$new_reph_pos])) {
                if (self::is_halant_or_coeng($info[$new_reph_pos])) {
                    for ($i = $base + 1; $i < $new_reph_pos; $i++)
                        if ($info[$i]['indic_category'] == self::OT_M) {
                            /* Ok, got it. */
                            $new_reph_pos--;
                        }
                }
            }


            /* Move */
            self::_move_info_pos($info, $start, $new_reph_pos+1);

            if ($start < $base && $base <= $new_reph_pos) {
                $base--;
            }
        }


        /*	o Reorder pre-base reordering consonants:
        *
        *	If a pre-base reordering consonant is found, reorder it according to
        *	the following rules:
        */


        if (count($GSUBdata['pref']) && $base + 1 < $end) { /* Otherwise there can't be any pre-base reordering Ra. */
            for ($i = $base + 1; $i < $end; $i++) {
                if ($info[$i]['mask'] & self::FLAG(self::PREF)) {
                    /*	1. Only reorder a glyph produced by substitution during application
                     *	of the <pref> feature. (Note that a font may shape a Ra consonant with
                     *	the feature generally but block it in certain contexts.)
                     */
// ??? Need to TEST if actual substitution has occurred
                    if ($i + 1 == $end || ($info[$i + 1]['mask'] & self::FLAG(self::PREF)) == 0) {
                        /*
                        *	2. Try to find a target position the same way as for pre-base matra.
                        *	If it is found, reorder pre-base consonant glyph.
                        *
                        *	3. If position is not found, reorder immediately before main
                        *	consonant.
                        */
                        $new_pos = $base;
                        /* Malayalam / Tamil do not have "half" forms or explicit virama forms.
                        * The glyphs formed by 'half' are Chillus or ligated explicit viramas.
                        * We want to position matra after them.
                        */
                        if ($scriptblock != UCDN::SCRIPT_MALAYALAM && $scriptblock != UCDN::SCRIPT_TAMIL) {
                            while ($new_pos > $start &&
                                !(self::is_one_of($info[$new_pos - 1], self::FLAG(self::OT_M) | self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng))))
                                $new_pos--;

                            /* In Khmer coeng model, a V,Ra can go *after* matras. If it goes after a
                            * split matra, it should be reordered to *before* the left part of such matra. */
                            if ($new_pos > $start && $info[$new_pos - 1]['indic_category'] == self::OT_M) {
                                $old_pos = i;
                                for ($i = $base + 1; $i < $old_pos; $i++)
                                    if ($info[$i]['indic_category'] == self::OT_M) {
                                        $new_pos--;
                                        break;
                                    }
                            }
                        }

                        if ($new_pos > $start && self::is_halant_or_coeng($info[$new_pos - 1])) {
                            /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
                            if ($new_pos < $end && self::is_joiner($info[$new_pos]))
                                $new_pos++;
                        }

                        $old_pos = $i;
                        self::_move_info_pos($info, $old_pos, $new_pos);

                        if ($new_pos <= $base && $base < $old_pos)
                            $base++;
                    }

                    break;
                }
            }
        }


        /* Apply 'init' to the Left Matra if it's a word start. */
        if ($info[$start]['indic_position'] == self::POS_PRE_M &&
            ($start==0 ||
                ($info[$start - 1]['general_category'] < UCDN::UNICODE_GENERAL_CATEGORY_FORMAT || $info[$start - 1]['general_category'] > UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
            )) {
            $info[$start]['mask'] |= self::FLAG(self::INIT);
        }


        /*
        * Finish off and go home!
        */

    }

    function _move_info_pos(&$info, $from, $to) {
        $t = array();
        $t[0] = $info[$from];
        if ($from > $to) {
            array_splice($info, $from, 1);
            array_splice($info, $to, 0, $t);
        }
        else {
            array_splice($info, $to, 0, $t);
            array_splice($info, $from, 1);
        }
    }


    public static $ra_chars = array(
        0x0930 => 1, /* Devanagari */
        0x09B0 => 1, /* Bengali */
        0x09F0 => 1, /* Bengali (Assamese) */
        0x0A30 => 1, /* Gurmukhi */		/* No Reph */
        0x0AB0 => 1, /* Gujarati */
        0x0B30 => 1, /* Oriya */
        0x0BB0 => 1, /* Tamil */		/* No Reph */
        0x0C30 => 1, /* Telugu */		/* Reph formed only with ZWJ */
        0x0CB0 => 1, /* Kannada */
        0x0D30 => 1, /* Malayalam */		/* No Reph, Logical Repha */

        0x0DBB => 1, /* Sinhala */		/* Reph formed only with ZWJ */
        0x179A => 1, /* Khmer */		/* No Reph, Visual Repha */
    );

    public static function is_ra ($u) {
        if (isset(self::$ra_chars[$u])) return true;
        return false;
    }

    public static function is_one_of ($info, $flags) {
        if (isset($info['is_ligature']) && $info['is_ligature']) return false;	/* If it ligated, all bets are off. */
        return !!(self::FLAG($info['indic_category']) & $flags);
    }

    public static function is_joiner($info) {
        return self::is_one_of ($info, (self::FLAG(self::OT_ZWJ) | self::FLAG(self::OT_ZWNJ)));
    }


    /* Vowels and placeholders treated as if they were consonants. */
    public static function is_consonant($info) {
        return self::is_one_of($info, (self::FLAG(self::OT_C) | self::FLAG(self::OT_CM) | self::FLAG(self::OT_Ra) | self::FLAG(self::OT_V) | self::FLAG(self::OT_NBSP) | self::FLAG(self::OT_DOTTEDCIRCLE)));
    }


    public static function is_halant_or_coeng($info) {
        return self::is_one_of($info, (self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng)));
    }



// From hb-private.hh
    public static function in_range ($u, $lo, $hi) {
        if ( (($lo^$hi) & $lo) == 0 && (($lo^$hi) & $hi) == ($lo^$hi) && (($lo^$hi) & (($lo^$hi) + 1)) == 0 )
            return ($u & ~($lo^$hi)) == $lo;
        else
            return $lo <= $u && $u <= $hi;
    }
// From hb-private.hh
    public static function FLAG($x) { return (1<<($x)); }


// BELOW from hb-ot-shape-complex-indic.cc

    /*
     * Indic configurations.
     */

// base_position
    const BASE_POS_FIRST = 0;
    const BASE_POS_LAST = 1;

// reph_position
    const REPH_POS_DEFAULT 		= 10;	// POS_BEFORE_POST,

    const REPH_POS_AFTER_MAIN	= 5;	// POS_AFTER_MAIN,
    const REPH_POS_BEFORE_SUB	= 7;	// POS_BEFORE_SUB,
    const REPH_POS_AFTER_SUB	= 9;	// POS_AFTER_SUB,
    const REPH_POS_BEFORE_POST 	= 10;	// POS_BEFORE_POST,
    const REPH_POS_AFTER_POST	= 12;	// POS_AFTER_POST

// reph_mode
    const REPH_MODE_IMPLICIT = 0;		/* Reph formed out of initial Ra,H sequence. */
    const REPH_MODE_EXPLICIT = 1;		/* Reph formed out of initial Ra,H,ZWJ sequence. */
    const REPH_MODE_VIS_REPHA = 2;	/* Encoded Repha character, no reordering needed. */
    const REPH_MODE_LOG_REPHA = 3;	/* Encoded Repha character, needs reordering. */



    /*
    struct of indic_configs{
        KEY - script;
        0 - has_old_spec;
        1 - virama;
        2 - base_pos;
        3 - reph_pos;
        4 - reph_mode;
    };
    */

    public static $indic_configs = array(	/* index is SCRIPT_number from UCDN */
        9 => array(true, 0x094D, 1, 10, 0),
        10 => array(true, 0x09CD, 1, 9, 0),
        11 => array(true, 0x0A4D, 1, 7, 0),
        12 => array(true, 0x0ACD, 1, 10, 0),
        13 => array(true, 0x0B4D, 1, 5, 0),
        14 => array(true, 0x0BCD, 1, 12, 0),
        15 => array(true, 0x0C4D, 1, 12, 1),
        16 => array(true, 0x0CCD, 1, 12, 0),
        17 => array(true, 0x0D4D, 1, 5, 3),
        18 => array(false, 0x0DCA, 0, 5, 1),	/* Sinhala */
        30 => array(false, 0x17D2, 0, 10, 2),	/* Khmer */
        84 => array(false, 0xA9C0, 1, 10, 0),	/* Javanese */

    );



    /*

    // from "hb-ot-shape-complex-indic-table.cc"


    const ISC_A	 = 0; //	INDIC_SYLLABIC_CATEGORY_AVAGRAHA		Avagraha
    const ISC_Bi = 8; //	INDIC_SYLLABIC_CATEGORY_BINDU			Bindu
    const ISC_C	 = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT		Consonant
    const ISC_CD = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD		Consonant_Dead
    const ISC_CF = 17; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL		Consonant_Final
    const ISC_CHL = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER	Consonant_Head_Letter
    const ISC_CM = 17; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL		Consonant_Medial
    const ISC_CP = 11; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER	Consonant_Placeholder
    const ISC_CR = 15; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA		Consonant_Repha
    const ISC_CS = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED	Consonant_Subjoined
    const ISC_ML = 0; //	INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER	Modifying_Letter
    const ISC_N	 = 3; //	INDIC_SYLLABIC_CATEGORY_NUKTA			Nukta
    const ISC_x	 = 0; //	INDIC_SYLLABIC_CATEGORY_OTHER			Other
    const ISC_RS = 13; //	INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER	Register_Shifter
    const ISC_TL = 0; //	INDIC_SYLLABIC_CATEGORY_TONE_LETTER		Tone_Letter
    const ISC_TM = 3; //	INDIC_SYLLABIC_CATEGORY_TONE_MARK		Tone_Mark
    const ISC_V	 = 4; //	INDIC_SYLLABIC_CATEGORY_VIRAMA		Virama
    const ISC_Vs = 8; //	INDIC_SYLLABIC_CATEGORY_VISARGA		Visarga
    const ISC_Vo = 2; //	INDIC_SYLLABIC_CATEGORY_VOWEL			Vowel
    const ISC_M	 = 7; //	INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT	Vowel_Dependent
    const ISC_VI = 2; //	INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT	Vowel_Independent

    const IMC_B	 = 8; //	INDIC_MATRA_CATEGORY_BOTTOM			Bottom
    const IMC_BR = 11; //	INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT	Bottom_And_Right
    const IMC_I	 = 15; //	INDIC_MATRA_CATEGORY_INVISIBLE		Invisible
    const IMC_L	 = 3; //	INDIC_MATRA_CATEGORY_LEFT			Left
    const IMC_LR = 11; //	INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT		Left_And_Right
    const IMC_x	 = 15; //	INDIC_MATRA_CATEGORY_NOT_APPLICABLE		Not_Applicable
    const IMC_O	 = 5; //	INDIC_MATRA_CATEGORY_OVERSTRUCK		Overstruck
    const IMC_R	 = 11; //	INDIC_MATRA_CATEGORY_RIGHT			Right
    const IMC_T	 = 6; //	INDIC_MATRA_CATEGORY_TOP			Top
    const IMC_TB = 8; //	INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM		Top_And_Bottom
    const IMC_TBR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT	Top_And_Bottom_And_Right
    const IMC_TL = 6; //	INDIC_MATRA_CATEGORY_TOP_AND_LEFT		Top_And_Left
    const IMC_TLR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT	Top_And_Left_And_Right
    const IMC_TR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_RIGHT		Top_And_Right
    const IMC_VOL = 2; //	INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT		Visual_Order_Left

    If in original table = _(C,x), that = ISC_C,IMC_x
    Value is IMC_x << 8 (or IMC_x * 256) = 3840
    plus ISC_C = 1, so = 3841

     */



    public static $indic_table = array(

        /* Devanagari  (0900..097F) */

        /* 0900 */ 3848,3848,3848,3848,3842,3842,3842,3842,
        /* 0908 */ 3842,3842,3842,3842,3842,3842,3842,3842,
        /* 0910 */ 3842,3842,3842,3842,3842, 3841, 3841, 3841,
        /* 0918 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0920 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0928 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0930 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0938 */  3841, 3841, 1543, 2823, 3843, 3840, 2823, 775,
        /* 0940 */  2823, 2055, 2055, 2055, 2055, 1543, 1543, 1543,
        /* 0948 */  1543, 2823, 2823, 2823, 2823, 2052, 775, 2823,
        /* 0950 */  3840, 3840, 3840, 3840, 3840, 1543, 2055, 2055,
        /* 0958 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0960 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0968 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0970 */  3840, 3840,3842,3842,3842,3842,3842,3842,
        /* 0978 */  3840, 3841, 3841, 3841, 3841, 3841, 3841, 3841,

        /* Bengali  (0980..09FF) */

        /* 0980 */  3840,3848,3848,3848, 3840,3842,3842,3842,
        /* 0988 */ 3842,3842,3842,3842,3842, 3840, 3840,3842,
        /* 0990 */ 3842, 3840, 3840,3842,3842, 3841, 3841, 3841,
        /* 0998 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09A0 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09A8 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09B0 */  3841, 3840, 3841, 3840, 3840, 3840, 3841, 3841,
        /* 09B8 */  3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 09C0 */  2823, 2055, 2055, 2055, 2055, 3840, 3840, 775,
        /* 09C8 */  775, 3840, 3840,2823,2823, 2052,3841, 3840,
        /* 09D0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 09D8 */  3840, 3840, 3840, 3840, 3841, 3841, 3840, 3841,
        /* 09E0 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 09E8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 09F0 */  3841, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 09F8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Gurmukhi  (0A00..0A7F) */

        /* 0A00 */  3840,3848,3848,3848, 3840,3842,3842,3842,
        /* 0A08 */ 3842,3842,3842, 3840, 3840, 3840, 3840,3842,
        /* 0A10 */ 3842, 3840, 3840,3842,3842, 3841, 3841, 3841,
        /* 0A18 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A20 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A28 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A30 */  3841, 3840, 3841, 3841, 3840, 3841, 3841, 3840,
        /* 0A38 */  3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 0A40 */  2823, 2055, 2055, 3840, 3840, 3840, 3840, 1543,
        /* 0A48 */  1543, 3840, 3840, 1543, 1543, 2052, 3840, 3840,
        /* 0A50 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A58 */  3840, 3841, 3841, 3841, 3841, 3840, 3841, 3840,
        /* 0A60 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A68 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A70 */ 3848, 3840,13841,13841, 3840, 3857, 3840, 3840,
        /* 0A78 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Gujarati  (0A80..0AFF) */

        /* 0A80 */  3840,3848,3848,3848, 3840,3842,3842,3842,
        /* 0A88 */ 3842,3842,3842,3842,3842,3842, 3840,3842,
        /* 0A90 */ 3842,3842, 3840,3842,3842, 3841, 3841, 3841,
        /* 0A98 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AA0 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AA8 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AB0 */  3841, 3840, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0AB8 */  3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 0AC0 */  2823, 2055, 2055, 2055, 2055, 1543, 3840, 1543,
        /* 0AC8 */  1543,2823, 3840, 2823, 2823, 2052, 3840, 3840,
        /* 0AD0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AD8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AE0 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0AE8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AF0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AF8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Oriya  (0B00..0B7F) */

        /* 0B00 */  3840,3848,3848,3848, 3840,3842,3842,3842,
        /* 0B08 */  3842,3842,3842,3842,3842, 3840, 3840,3842,
        /* 0B10 */  3842, 3840, 3840,3842,3842, 3841, 3841, 3841,
        /* 0B18 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B20 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B28 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B30 */  3841, 3840, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0B38 */  3841, 3841, 3840, 3840, 3843, 3840, 2823, 1543,
        /* 0B40 */  2823, 2055, 2055, 2055, 2055, 3840, 3840, 775,
        /* 0B48 */  1543, 3840, 3840,2823,2823,2052, 3840, 3840,
        /* 0B50 */  3840, 3840, 3840, 3840, 3840, 3840, 1543,2823,
        /* 0B58 */  3840, 3840, 3840, 3840, 3841, 3841, 3840, 3841,
        /* 0B60 */  3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0B68 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0B70 */  3840, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0B78 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Tamil  (0B80..0BFF) */

        /* 0B80 */  3840, 3840, 3848, 3840, 3840, 3842, 3842, 3842,
        /* 0B88 */  3842, 3842, 3842, 3840, 3840, 3840, 3842,3842,
        /* 0B90 */  3842, 3840, 3842, 3842, 3842, 3841, 3840, 3840,
        /* 0B98 */  3840, 3841, 3841, 3840, 3841, 3840, 3841, 3841,
        /* 0BA0 */  3840, 3840, 3840, 3841, 3841, 3840, 3840, 3840,
        /* 0BA8 */  3841, 3841, 3841, 3840, 3840, 3840, 3841, 3841,
        /* 0BB0 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0BB8 */  3841, 3841, 3840, 3840, 3840, 3840, 2823, 2823,
        /* 0BC0 */  1543, 2055, 2055, 3840, 3840, 3840, 775, 775,
        /* 0BC8 */  775, 3840, 2823, 2823, 2823, 1540, 3840, 3840,
        /* 0BD0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 0BD8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BE0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BE8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BF0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BF8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Telugu  (0C00..0C7F) */

        /* 0C00 */  3840,3848,3848,3848, 3840,3842,3842,3842,
        /* 0C08 */ 3842,3842,3842,3842,3842, 3840,3842,3842,
        /* 0C10 */ 3842, 3840,3842,3842,3842, 3841, 3841, 3841,
        /* 0C18 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C20 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C28 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C30 */  3841, 3841, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0C38 */  3841, 3841, 3840, 3840, 3840, 3840, 1543, 1543,
        /* 0C40 */  1543, 2823, 2823, 2823, 2823, 3840, 1543, 1543,
        /* 0C48 */ 2055, 3840, 1543, 1543, 1543, 1540, 3840, 3840,
        /* 0C50 */  3840, 3840, 3840, 3840, 3840, 1543, 2055, 3840,
        /* 0C58 */  3841, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C60 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0C68 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C70 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C78 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Kannada  (0C80..0CFF) */

        /* 0C80 */  3840, 3840,3848,3848, 3840,3842,3842,3842,
        /* 0C88 */ 3842,3842,3842,3842,3842, 3840,3842,3842,
        /* 0C90 */ 3842, 3840,3842,3842,3842, 3841, 3841, 3841,
        /* 0C98 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CA0 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CA8 */  3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CB0 */  3841, 3841, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0CB8 */  3841, 3841, 3840, 3840, 3843, 3840, 2823, 1543,
        /* 0CC0 */ 2823, 2823, 2823, 2823, 2823, 3840, 1543,2823,
        /* 0CC8 */ 2823, 3840,2823,2823, 1543, 1540, 3840, 3840,
        /* 0CD0 */  3840, 3840, 3840, 3840, 3840, 2823, 2823, 3840,
        /* 0CD8 */  3840, 3840, 3840, 3840, 3840, 3840, 3841, 3840,
        /* 0CE0 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0CE8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0CF0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0CF8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,

        /* Malayalam  (0D00..0D7F) */

        /* 0D00 */  3840, 3840,3848,3848, 3840,3842,3842,3842,
        /* 0D08 */ 3842,3842,3842,3842,3842, 3840,3842,3842,
        /* 0D10 */ 3842, 3840,3842,3842,3842, 3841, 3841, 3841,
        /* 0D18 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D20 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D28 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D30 */  3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D38 */  3841, 3841, 3841, 3840, 3840, 3840, 2823, 2823,
        /* 0D40 */  2823, 2823, 2823, 2055, 2055, 3840, 775, 775,
        /* 0D48 */  775, 3840,2823,2823,2823, 1540, 3855, 3840,
        /* 0D50 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 0D58 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D60 */ 3842,3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0D68 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D70 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D78 */  3840, 3840,3841,3841,3841,3841,3841,3841,

        /* Sinhala  (0D80..0DFF) */

        /* 0D80 */  3840,  3840, 3848, 3848,  3840, 3842, 3842, 3842,
        /* 0D88 */  3842, 3842, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 0D90 */  3842, 3842, 3842, 3842, 3842, 3842, 3842,  3840,
        /* 0D98 */  3840,  3840,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 0DA0 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 0DA8 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 0DB0 */  3841,  3841,  3840,  3841,  3841,  3841,  3841,  3841,
        /* 0DB8 */  3841,  3841,  3841,  3841,  3840,  3841,  3840,  3840,
        /* 0DC0 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3840,
        /* 0DC8 */  3840,  3840,  1540,  3840,  3840,  3840,  3840,  2823,
        /* 0DD0 */  2823,  2823,  1543,  1543,  2055,  3840,  2055,  3840,
        /* 0DD8 */  2823,  775, 1543,  775, 2823, 2823, 2823,  2823,
        /* 0DE0 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 0DE8 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 0DF0 */  3840,  3840,  2823,  2823,  3840,  3840,  3840,  3840,
        /* 0DF8 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,


        /* Vedic Extensions  (1CD0..1CFF) */

        /* 1CD0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CD8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CE0 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CE8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CF0 */  3840, 3840,3848,3848, 3840, 3840, 3840, 3840,
        /* 1CF8 */  3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,


    );

    public static $khmer_table = array(

        /* Khmer  (1780..17FF) */

        /* 1780 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 1788 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 1790 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 1798 */  3841,  3841,  3841,  3841,  3841,  3841,  3841,  3841,
        /* 17A0 */  3841,  3841,  3841, 3842, 3842, 3842, 3842, 3842,
        /* 17A8 */  3842, 3842, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 17B0 */  3842, 3842, 3842, 3842,  3840,  3840,  2823,  1543,
        /* 17B8 */  1543,  1543,  1543,  2055,  2055,  2055, 1543,2823,
        /* 17C0 */  2823,  775,  775,  775, 2823, 2823, 3848, 3848,
        /* 17C8 */  2823, 3853, 3853,  3840, 3855,  3840,  3840,  3840,
        /* 17D0 */  3840,  1540,  3844,  3840,  3840,  3840,  3840,  3840,
        /* 17D8 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 17E0 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 17E8 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 17F0 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,
        /* 17F8 */  3840,  3840,  3840,  3840,  3840,  3840,  3840,  3840,


    );



// from "hb-ot-shape-complex-indic-table.cc"
    public static function indic_get_categories ($u) {
        if (0x0900 <= $u && $u <= 0x0DFF) return self::$indic_table[$u - 0x0900 + 0];	// offset 0 for Most "indic"
        if (0x1CD0 <= $u && $u <= 0x1D00) return self::$indic_table[$u - 0x1CD0 + 1152];	// offset for Vedic extensions
        if (0x1780 <= $u && $u <= 0x17FF) return self::$khmer_table[$u - 0x1780];		// Khmer
        if ($u == 0x00A0) return 3851;	// (ISC_CP | (IMC_x << 8))
        if ($u == 0x25CC) return 3851;	// (ISC_CP | (IMC_x << 8))
        return 3840;	// (ISC_x | (IMC_x << 8))
    }

// BELOW from hb-ot-shape-complex-indic.cc
    /*
     * Indic shaper.
     */

    public static function IN_HALF_BLOCK($u, $Base) { return (($u & ~0x7F) == $Base); }

    public static function IS_DEVA($u) { return self::IN_HALF_BLOCK ($u, 0x0900); }
    public static function IS_BENG($u) { return self::IN_HALF_BLOCK ($u, 0x0980); }
    public static function IS_GURU($u) { return self::IN_HALF_BLOCK ($u, 0x0A00); }
    public static function IS_GUJR($u) { return self::IN_HALF_BLOCK ($u, 0x0A80); }
    public static function IS_ORYA($u) { return self::IN_HALF_BLOCK ($u, 0x0B00); }
    public static function IS_TAML($u) { return self::IN_HALF_BLOCK ($u, 0x0B80); }
    public static function IS_TELU($u) { return self::IN_HALF_BLOCK ($u, 0x0C00); }
    public static function IS_KNDA($u) { return self::IN_HALF_BLOCK ($u, 0x0C80); }
    public static function IS_MLYM($u) { return self::IN_HALF_BLOCK ($u, 0x0D00); }
    public static function IS_SINH($u) { return self::IN_HALF_BLOCK ($u, 0x0D80); }
    public static function IS_KHMR($u) { return self::IN_HALF_BLOCK ($u, 0x1780); }


    public static function MATRA_POS_LEFT($u) 	{ return self::POS_PRE_M; }
    public static function MATRA_POS_RIGHT($u) 	{ return
        (self::IS_DEVA($u) ? self::POS_AFTER_SUB  :
            (self::IS_BENG($u) ? self::POS_AFTER_POST :
                (self::IS_GURU($u) ? self::POS_AFTER_POST :
                    (self::IS_GUJR($u) ? self::POS_AFTER_POST :
                        (self::IS_ORYA($u) ? self::POS_AFTER_POST :
                            (self::IS_TAML($u) ? self::POS_AFTER_POST :
                                (self::IS_TELU($u) ? ($u <= 0x0C42 ? self::POS_BEFORE_SUB : self::POS_AFTER_SUB) :
                                    (self::IS_KNDA($u) ? ($u < 0x0CC3 || $u > 0xCD6 ? self::POS_BEFORE_SUB : self::POS_AFTER_SUB) :
                                        (self::IS_MLYM($u) ? self::POS_AFTER_POST :
                                            (self::IS_SINH($u) ? self::POS_AFTER_SUB  :
                                                (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                                                    self::POS_AFTER_SUB)))))))))));	/*default*/
    }
    public static function MATRA_POS_TOP($u) 		{ return  /* BENG and MLYM don't have top matras. */
        (self::IS_DEVA($u) ? self::POS_AFTER_SUB	:
            (self::IS_GURU($u) ? self::POS_AFTER_POST : /* Deviate from spec */
                (self::IS_GUJR($u) ? self::POS_AFTER_SUB	:
                    (self::IS_ORYA($u) ? self::POS_AFTER_MAIN :
                        (self::IS_TAML($u) ? self::POS_AFTER_SUB	:
                            (self::IS_TELU($u) ? self::POS_BEFORE_SUB :
                                (self::IS_KNDA($u) ? self::POS_BEFORE_SUB :
                                    (self::IS_SINH($u) ? self::POS_AFTER_SUB  :
                                        (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                                            self::POS_AFTER_SUB)))))))));	/*default*/
    }
    public static function MATRA_POS_BOTTOM($u)	{ return
        (self::IS_DEVA($u) ? self::POS_AFTER_SUB	:
            (self::IS_BENG($u) ? self::POS_AFTER_SUB	:
                (self::IS_GURU($u) ? self::POS_AFTER_POST :
                    (self::IS_GUJR($u) ? self::POS_AFTER_POST :
                        (self::IS_ORYA($u) ? self::POS_AFTER_SUB	:
                            (self::IS_TAML($u) ? self::POS_AFTER_POST :
                                (self::IS_TELU($u) ? self::POS_BEFORE_SUB :
                                    (self::IS_KNDA($u) ? self::POS_BEFORE_SUB :
                                        (self::IS_MLYM($u) ? self::POS_AFTER_POST :
                                            (self::IS_SINH($u) ? self::POS_AFTER_SUB  :
                                                (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                                                    self::POS_AFTER_SUB)))))))))));	/*default*/
    }

    public static function matra_position ($u, $side) {
        switch ($side) {
            case self::POS_PRE_C:	return self::MATRA_POS_LEFT($u);
            case self::POS_POST_C:	return self::MATRA_POS_RIGHT($u);
            case self::POS_ABOVE_C:	return self::MATRA_POS_TOP($u);
            case self::POS_BELOW_C:	return self::MATRA_POS_BOTTOM($u);
        }
        return $side;
    }

// vowel matras that have to be split into two parts.
// From Harfbuzz (old)
// New HarfBuzz uses /src/hb-ucdn/ucdn.c and unicodedata_db.h for full method of decomposition for all characters
// Should always fully decompose and then recompose back, but we will just do the split matras
    public static function decompose_indic($ab) {
        $sub = array();
        switch ($ab) {
            /*
            * Decompose split matras.
            */
            /* bengali */
            case 0x9cb 	: $sub[0] = 0x9c7; $sub[1]= 0x9be; return $sub;
            case 0x9cc 	: $sub[0] = 0x9c7; $sub[1]= 0x9d7; return $sub;
            /* oriya */
            case 0xb48 	: $sub[0] = 0xb47; $sub[1]= 0xb56; return $sub;
            case 0xb4b 	: $sub[0] = 0xb47; $sub[1]= 0xb3e; return $sub;
            case 0xb4c 	: $sub[0] = 0xb47; $sub[1]= 0xb57; return $sub;
            /* tamil */
            case 0xbca 	: $sub[0] = 0xbc6; $sub[1]= 0xbbe; return $sub;
            case 0xbcb 	: $sub[0] = 0xbc7; $sub[1]= 0xbbe; return $sub;
            case 0xbcc 	: $sub[0] = 0xbc6; $sub[1]= 0xbd7; return $sub;
            /* telugu */
            case 0xc48 	: $sub[0] = 0xc46; $sub[1]= 0xc56; return $sub;
            /* kannada */
            case 0xcc0 	: $sub[0] = 0xcbf; $sub[1]= 0xcd5; return $sub;
            case 0xcc7 	: $sub[0] = 0xcc6; $sub[1]= 0xcd5; return $sub;
            case 0xcc8 	: $sub[0] = 0xcc6; $sub[1]= 0xcd6; return $sub;
            case 0xcca 	: $sub[0] = 0xcc6; $sub[1]= 0xcc2; return $sub;
            case 0xccb 	: $sub[0] = 0xcc6; $sub[1]= 0xcc2; $sub[2]= 0xcd5; return $sub;
            /* malayalam */
            case 0xd4a 	: $sub[0] = 0xd46; $sub[1]= 0xd3e; return $sub;
            case 0xd4b 	: $sub[0] = 0xd47; $sub[1]= 0xd3e; return $sub;
            case 0xd4c 	: $sub[0] = 0xd46; $sub[1]= 0xd57; return $sub;
            /* sinhala */
            // NB Some fonts break with these Sinhala decomps (although this is Uniscribe spec)
            // Can check if character would be substituted by pstf and only decompose if true
            // e.g. if (isset($GSUBdata['pstf'][$ab])) - would need to pass $GSUBdata as parameter to this function
            case 0xdda	: $sub[0] = 0xdd9; $sub[1]= 0xdca; return $sub;
            case 0xddc	: $sub[0] = 0xdd9; $sub[1]= 0xdcf; return $sub;
            case 0xddd	: $sub[0] = 0xdd9; $sub[1]= 0xdcf; $sub[2]= 0xdca; return $sub;
            case 0xdde	: $sub[0] = 0xdd9; $sub[1]= 0xddf; return $sub;
            /* khmer */
            case 0x17be : $sub[0] = 0x17c1; $sub[1]= 0x17be; return $sub;
            case 0x17bf : $sub[0] = 0x17c1; $sub[1]= 0x17bf; return $sub;
            case 0x17c0 : $sub[0] = 0x17c1; $sub[1]= 0x17c0; return $sub;

            case 0x17c4 : $sub[0] = 0x17c1; $sub[1]= 0x17c4; return $sub;
            case 0x17c5 : $sub[0] = 0x17c1; $sub[1]= 0x17c5; return $sub;
            /* tibetan - included here although does not use Inidc shaper in other ways  */
            case 0xf73  : $sub[0] = 0xf71; $sub[1]= 0xf72; return $sub;
            case 0xf75  : $sub[0] = 0xf71; $sub[1]= 0xf74; return $sub;
            case 0xf76  : $sub[0] = 0xfb2; $sub[1]= 0xf80; return $sub;
            case 0xf77  : $sub[0] = 0xfb2; $sub[1]= 0xf81; return $sub;
            case 0xf78  : $sub[0] = 0xfb3; $sub[1]= 0xf80; return $sub;
            case 0xf79	: $sub[0] = 0xfb3; $sub[1]= 0xf71; $sub[2]= 0xf80; return $sub;
            case 0xf81  : $sub[0] = 0xf71; $sub[1]= 0xf80; return $sub;
        }
        return false;
    }





    public static function bubble_sort(&$arr, $start, $len) {
        if ($len<2) { return;}
        $k = $start+$len-2;
        while ($k >= $start) {
            for ($j=$start; $j<=$k; $j++) {
                if ($arr[$j]['indic_position'] > $arr[$j + 1]['indic_position']) {
                    $t = $arr[$j];
                    $arr[$j] = $arr[$j + 1];
                    $arr[$j + 1] = $t;
                }
            }
            $k--;
        }
    }




}	// end Class

?>